小编Aru*_*run的帖子

要将JSON字符串反序列化为类列表,请在StackOverflow问题中列出不同的方法

类型1(文档链接):

List<SomeClass> someClassList = mapper.readValue(jsonString, typeFactory.constructCollectionType(List.class, SomeClass.class));

类型2(文档链接):

List<SomeClass> list = mapper.readValue(jsonString, new TypeReference<List<SomeClass>>() { });

虽然上述两种类型都可以完成这项工作,但这些实现有何区别？

我正在尝试创建一个Android MapView.

在实现本文的第2部分中ItemizedOverlay,Eclipse无法从构建路径中获取它.

我不确定SDK的哪个部分缺失.

我有一个从同一个Statement对象生成的2个ResultSet.

代码示例如下:

Connection con            = null;
Statement  stmt           = null;
ResultSet rs = null;

con = DBAccess.getConnection();
stmt = con.createStatement();

rs = stmt.executeQuery(Query1);
// operate on the resultset

rs = stmt.executeQuery(Query2);   // Is it legal and do not have side-effects?
// operate on the resultset

// close everythings (Resultset, Statement, Connection)

我检查它运作良好.我怀疑是否会有任何副作用？

import java.lang.reflect.Method;
import java.util.Arrays;

public class Test
{
     public static void main(String s[]) throws ClassNotFoundException
     {
        Class cls = Class.forName("Test");
        System.out.println("Class is "+cls);
        Method[] mtds = cls.getMethods();
        System.out.println("Methods are "+Arrays.deepToString(mtds));  // not having all methods
    }

    void reflectionTestMethod()
    {
        System.out.println("test");
    }
}

输出是

类是Test

方法是[public static void Test.main(java.lang.String [])throws java.lang.ClassNotFoundException,public final void java.lang.Object.wait()throws java.lang.InterruptedException,public final native void java. lang.Object.wait(long)抛出java.lang.InterruptedException,public final void java.lang.Object.wait(long,int)throws java.lang.InterruptedException,public boolean java.lang.Object.equals(java.lang .Object),public java.lang.String java.lang.Object.toString(),public native int java.lang.Object.hashCode(),public final native java.lang.Class java.lang.Object.getClass() ,public final native void java.lang.Object.notify(),public …